1961-2010年江苏省夏季气温变化及其异常时环流场特征  

Variation of 1961—2010 summer temperature abnormal in Jiangsu and its circulation background features

作　　者：周放[1] 孙照渤[1,2] 

机构地区：[1]南京信息工程大学,大气科学学院,南京210044 [2]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044

出　　处：《气象科学》2014年第1期96-103,共8页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41105059);江苏省高校自然科学研究项目(11KJB170006)

摘　　要：利用1961—2010年江苏省41个台站气温资料,500 hPa高度场和海温场等资料对江苏省夏季气温变化进行研究,并分析同期及前期环流场特征。结果表明:(1)江苏省夏季气温变化幅度南北差异较大,南强北弱。(2)夏季平均气温的变化幅度总是小于其他3个季节。(3)各区夏季异常低温日数在1970s以前呈现增多趋势,1970s以后呈现减少趋势;而异常高温日数在1970s以前呈现减少趋势,1970s以后呈现增多趋势。(4)冷夏年500 hPa高度上,西太平洋副热带高压强度较弱,位置偏东,而东亚大槽较深,位置偏西,环流经向性较大;暖夏年反之。(5)冷夏及冷夏前期,海温场分布具有La Nina事件特征,而在暖夏及暖夏前期,海温场分布具有El Nino事件特征。By using the 50 a （1961—2010） monthly temperature data from 41 sires in Jiangsu prov- ince, 500 hPa height field and SST field, the spatial and temporal characteristics of summer temperature and its related anomalous general atmosphere circulation are analyzed. It is found that the amplitude of summer temperature becomes stronger from north to south in Jiangsu province; amplitude of summer tem- perature is always smaller than that of other three seasons ; the days of negative anomaly show an increas- ing-decreasing trend in each region, but opposite in the positive anomaly; furthermore, the 500 hPa height anomaly of cold summers, bears the characteristics of negative anomaly in Korean Peninsula, which shows meridional circulation in high latitude in Asia, while in warm summers a positive anomaly occurs in Korean Peninsula, which shows zonal circulation in high latitude in Asia; in pre-eold summers, it shows weak western Pacific subtropical high, while in pre-warm ones, western Pacific subtropical high becomes strong. The SST takes on La Nina features in cold and pre-eold summers, while El Nino featuresin warm and pre-warm summers.

关 键 词：夏季气温 异常 环流场特征 

分 类 号：P468.021[天文地球—大气科学及气象学]